Summary: Works with Supermicro MBD-X10SAE-O and MBD-X10SLH-F-O. Motherboards detected speed of RAM automatically. I was a little worried that it would not be compatible but it has worked out after all.
Summary: Kingston pulled support of this memory for the x10sl7-f after originally being mentioned as supported on their website. I've had nothing but issues with this memory, and memtest86 shows 65k+ errors. The problem is that this memory is incompatible with this board if you use 32GB. If you use 16GB (only two dimm slots) you won't run into these issues. There's a fairly large thread on the freenas forum about this board.
Summary: Put these in the server and they came up without a hitch. The motherboard is from Supermicro. We are running virtual servers and everything is running without a hitch. This is ECC memory at a really reasonable price. No disappointments here.